>> low haircut, dark complected, middle age. how many are you describing when you describe that? you describe most of the majority of the men in american. >> plus i hit the streets of d.c. to demonstrate the effectiveness of one iding procedure with a penny. urgency? only on al jazeera america ♪ >>> in fact, in all of the dna exonerations that have happened to date, sent % have involved identification. >> welcome back. al jazeera america is getting ready to debut a powerful new documentary series called "the system" we are taking a look at the dark corners of the u.s. criminal justice system. joining us on skype out of new orleans is emily mau, director of the innocence project dedicated to exonerating wrongfully convicted individuals. from atlanta, georgia, jonathan rapping, founder of gideon's promise which provides public defense for low-income citizenship. thanks for being here. one of the issues exposed in our series is how unstable eyewitness testimony can be. why is it unreliable? >> well, i mean there are lots of reasons. there are, i would say, many issues now been ident